iio: dac: ltc2688: make use of devm_mutex_init()

Use devm_mutex_init() since it brings some benefits when
CONFIG_DEBUG_MUTEXES is enabled.

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Nuno Sá 2025-09-23 09:41:47 +01:00 • committed by Jonathan Cameron
commit 620636f497